I just added these in, but every chapter will have an ending card like the classic game levels.
The Kills stat is pretty simple, the amount of demons the Slayer killed in each chapter. And the Time stat is supposed to be a stat of how much time has passed on Mars in that chapter - makes it easier to keep track of the story's timeline.
However, the interesting one is the Secrets stat. This is the number of Easter Eggs that I have included within each chapter, and which I will be listing in this tab (in no particular order).
E1M1
Elite Guard Commando uses zombie voice lines from Brutal Doom.
E1M2
Ruby being sheltered from the Lazarus Wave attack in an elevator is inspired by the similar plot element in Doom VFR.
The tik tik tik heard when Ruby is being stalked by a prowling imp is based on the similar notes in the classic Imp Song.
The prototype UAC Bio Armor is based on the classic blue megaarmor.
E1M3
The Marine deriding the irresponsibly placed nukage barrels is inspired by the...environmentally conscious Doomguy in the infamous Doom comic.
The Power Colt handgun is based on the protagonist of Far Cry 3 Blood Dragon, Rex "Power" Colt.
The Flamer zombie is inspired by the Pyro class in Team Fortress 2. Lore-wise, UAC Flamer Specialists are supposed to be biohazard workers that use flamethrowers to safely cremate biohazardous demonic gore/tissues in the event of breaches or contaminations.
This may come as a surprise, but Hiro Romero's name is inspired by the classic Doom designer John Romero and the protagonist of his infamous game Daikatana, Hiro Miyamoto.
The flashback where the Marine remembers finding a plasma gun in Deimos comes from the classic game, where the plasma gun is first found as a secret in the first level of the second episode, the Deimos Anomaly.
Hiro Romero's "big iron" is a reference to the song "Big Iron." In other news, the floor is made out of floor.
E1M4
The 211-V Plasma Cutter is taken straight out of Dead Space.
The Marine acquiring the super shotgun from a dead soldier references the infamous MAP21 Nirvana/super shotgun theory.
The Marine's former sergeant Mahonin is inspired by the antagonist from the 2005 Doom film, Sgt. Asher Mahonin.
The Headless Kamikaze enemy is taken straight out of the Serious Sam series, though customized to fit the Doom universe.
Excavation Site 32 is based on the Excavation map from Doom 2016's multiplayer.
"Hell devours the indolent" is a tutorial tip in Doom 2016.
"Too rough to be called music" is a reference to the famous Berserk quote about Guts' sword.
E1M5
The Argent plasma Extraction map is based on the Extraction map from Doom Eternal's Battlemode.
The Tree of Perdiition's various prophetic lines are inspired by the whispering tree's speech in the Kadingir Sanctum level of Doom 2016.
Furthermore, the Tree of Perdition also references the Perdition map in Doom 2016's multiplayer.
E1M6
The Sentinel bonfires are based on the famous bonfires from Dark Souls.
The Daedric warrior with a Dragonbone arrow in his knee references the similar Skyrim easter egg in Doom 2016's Kadingir Sanctum.
The Exorcist is inspired by Keanu Reeves' film version of John Constantine.
Similarly, the Exorcist's quote of "Passive. A perfect circle" references the song from the film. HOW DID NOBODY GET THIS.
The classified UAC FTL-capable ship "Event Horizon" is inspired by the film of the same name, which tells the story of another FTL ship lost in its maiden voyage in 2040, six years before the Phobos Event.
The Scrag enemy is taken straight out of Quake.
The "1337" in the maze map's upper-right corner is based on the leetspeak easter egg in Doom RPG.
The Slayer's flashback to his Phobos deployment - including the emergency transmission and "watching restricted flicks in the rec room" - is based on the plot synopsis from the classic Doom manual.
The fact that Hell Knights and Barons don't infight is based on the similar mechanic in classic Doom.
The Dark Claw rune takes its name and description from a mentioned weapon in the Doom Bible.
John Doe uses the famous "Kill me!" line from the Predator film.
John's "I'm the man" line comes from Brutal Doom.
The "imp by itself in multiple locations" line comes from Markiplier's playthrough of Doom 2016, also in the Kadingir level.
The Blur Artifact's operation and name is based on the classic partial invisibility powerup, though it also functions similar to the classic no-clip cheat.
The Blood Prism enemy is based on the Ramiel angel from the first Rebuild of Evangelion film.
John Doe's "barrels o' fun" line takes its name from a level in Doom II.
The Parasite Moons are inspired by the Brethren Moons in Dead Space.
The Drow offering cube is based on the spawn cube from Classic Doom.
The Iron Sight powerup takes its name from the eponymous mechanic in most shooter games, also meant to amplify their user's accuracy.
Lt. Rogers' line of "I don't want to turn" comes from Brutal Doom.
John Doe's line of "you're gonna be stupid and dead" also comes from Brutal Doom.
The 2700 series plasma cannon that the Slayer remembers using back in Phobos is based on the BFG 2704 mentioned in the Doom Bible and shown in an early Doom beta, a rapid-fire plasma chaingun.
The closing line of there being "Hell to pay" references both the miracleofsound and Five Finger Death Punch songs, the former of which is actually inspired by Doom 2016.
John Doe's line of "Burn motherfucker burn" references another FFDP song.
The Dark Claw's secondary function of turning demons into timed biobombs is based on a similar mechanic in Prototype 2.
The Slayer finding the mutilated bodies of his squadmates on Phobos (impaled or hanging) is based on the corpse props in classic Doom.
E1M7
The demonic Pilots and ATLAS mechs are heavily inspired by the Pilots and Titan mechs in the game series Titanfall.
The Pilot's fragboosting, slidehopping, and slingshotting are based on actual player movement techniques in Titanfall.
This chapter also features mech melee executions from Titanfall 2 - the Slayer sweeping the Falcon's leg and killing the Pilot with a railgun, the Phalanx reaching into the Firebolt's cabin and pulling the Pilot out before crushing them, and the Phalanx using the Scorch execution of punching an enemy mech twice before raising its hands and destroying it with a flame wave.
Each locker the Slayer opens in the technician storage area references a player class in Team Fortress 2.
The pressure valves in the same area, caked shut with grime and releasing only steam, references TF2's publisher Valve and their notoriously slow release schedule.
The mysterious Europa base code-named Tei Tenga is based on an obscure location in classic Doom.
The Sentry Bot's Phalanx construct is inspired by the same-named Sentry Bot in Fallout.
The chapter's title - "Unto the Evil" - comes from a DLC in Doom 2016, which also introduced the Harvester enemy.
Hayden's line of the demon's "staking their claim on Mars" comes from the intro text screen in Doom 2016's 7th level, the destroyed Argent Facility (replaced in DoW with the Spaceport).
The waspid enemy are based on the aspid enemies in Hollow Knight.
The foul-mouthed UAC researcher Dr. Croshaw takes his name from famous Internet comedian, critic, writer, journalist (one of the good ones!), video game developer, and podcaster Ben "Yahtzee" Croshaw, most well-known for his video game review series Zero Punctuation (running since 2007!) and his...colorful use of the English language. Remember the PC Master Race meme? That was this guy. Furthermore, the data log in which the eponymous researcher criticizes the UAC deploying unpredictable bioweapons over simple and reliable firearms comes straight from Yahtzee's ZP episode of Resident Evil 8, in which he addresses that popular video game trope.
The artwork of the looming gateway planetoid is based on the depiction of Deimos in Hell from classic Doom.
Phillip Osborne's line of "Die motherfucker die!" is based on the eponymous Dope song (yes, Dope is the name of the band).
The demonic mimics are based on a similar enemy from the 2017 video game Prey.
The scene alluding the line "there's always a bigger fish" references Star Wars: The Phantom Menace.
The Exo Zombies take their name from a game mode in the futuristic Call of Duty: Advanced Warfare, also depicting augmented zombies.